S1·E3 American Dreamers

After a skeleton is found on a tour bus and turns out to be over a decade old, Mac and the team use the backpack they have found to track the belongings to a young man named Aaron Moreland, only to learn that the body they have cannot possibly belong to him. By tracing the victim's shirt, detectives are led to a youth center worker who claims not to remember the boy, but is hiding an old secret of his own.